Transmission with structure for preventing rotation of snap ring

Abstract

The transmission having a structure preventing snap ring rotation includes a first driver including an input shaft configured to receive power from the outside, a second driver arranged apart from the first driver, optionally connected to the first driver, and including an output shaft configured to output power, a third driver arranged between the first driver and the second driver and having one end to which a support bearing is coupled, and a case including a first insertion hole into which the first driver is inserted, a second insertion hole into which the second driver is inserted, a third insertion hole into which the third driver is inserted.

What is claimed is: 
     
       1. A transmission having a structure preventing snap ring rotation, the transmission comprising:
 a first driver comprising an input shaft configured to receive power from outside; 
 a second driver arranged apart from the first driver, optionally connected to the first driver, and comprising an output shaft configured to output power; 
 a third driver arranged between the first driver and the second driver and having one end to which a support bearing is coupled; and 
 a case comprising a first insertion hole into which the first driver is inserted, a second insertion hole into which the second driver is inserted, a third insertion hole into which the third driver is inserted and having a snap ring arranged therein to surround at least a portion of an outer surface of the support bearing, and a stopper formed between and in correspondence with both ends of the snap ring, 
 wherein both sides of the stopper facing the both ends of the snap ring are tapered downward, and 
 wherein the stopper comprises a locking protrusion above the snap ring, and at least a portion of the locking protrusion overlaps the snap ring in a thickness direction of the snap ring, 
 wherein the third insertion hole comprises a first insertion groove arranged in an inner circumferential surface thereof and into which the snap ring is inserted, and 
 the support bearing comprises a second insertion groove arranged in an outer circumferential surface thereof and into which the snap ring is inserted. 
 
     
     
       2. A transmission having a structure preventing snap ring rotation, the transmission comprising:
 a first driver comprising an input shaft configured to receive power from outside; 
 a second driver arranged apart from the first driver, optionally connected to the first driver, and comprising an output shaft configured to output power; 
 a third driver arranged between the first driver and the second driver and having one end to which a support bearing is coupled; and 
 a case comprising a first insertion hole into which the first driver is inserted, a second insertion hole into which the second driver is inserted, a third insertion hole into which the third driver is inserted and having a snap ring arranged therein to surround at least a portion of an outer surface of the support bearing, and a stopper formed between and in correspondence with both ends of the snap ring, 
 wherein both sides of the stopper facing the both ends of the snap ring are tapered downward, and 
 wherein the stopper comprises a locking protrusion above the snap ring, and at least a portion of the locking protrusion overlaps the snap ring in a thickness direction of the snap ring, 
 wherein the third insertion hole comprises a rib protruding along at least a portion of a circumference thereof and an open area in which the rib is not formed, and 
 the stopper is arranged in the open area, and 
 wherein the stopper has an inner end portion thereof arranged closer to an outer circumference of the snap ring than to an inner circumference of the snap ring. 
 
     
     
       3. The transmission of  claim 2 , wherein the both ends of the snap ring are arranged apart from both surfaces of the stopper by a certain distance in the open area. 
     
     
       4. The transmission of  claim 2 , wherein the stopper is arranged only inside the open area.